Chip breaker



Dec. 6, 1927. 15,651,529 w. D. JOHNSON CHIP BREAKER Filed Feb. 1927 y lll/l Z5 l MM35@ 5.@ @@MM SWW-Q' M* @7325 Patented Dec. (V5, 1927.A

UNITE STATS WALLACE AD. .roHNsom oE-EELo1T,jWIscoNs1N, Assreflvon' .To YATEs-AMERICAN- MA- OEINECQMPANY; .0F fBELoiT, wisconsin, jAYcomfortArron 0E DELAWARE @This invention relates to' Wood Working machines', and more partieiilarlyy to the Vchip breakers associated' with the outt'er k,heads of such machines.` Y Y to'fprovide improved means 'in the 4form ot a novel. air snubber-"for holding' the chip breaker" firmly against the iv'ork irrespective ot" Changes inthe 'position 'of theV chip Vbreaker occasioned fluctuations' i in the dimensions of 'the'w'orl Y 'K'An'other' important" lease of the Chip bi'eaker, Still another important object ,is vto pro'- k videa multiple-part shoe for the chip breaker artfnpon a' full anderstanding' of" thereon`V n'j ivhehitliejpart's" are zljoth .interchangeable in pcsitionfaiidy separately reversibleivhereby to'.Lperinitfconvenient andeoonoinitiall main# tenanee of the 'proper 'surface' atfthe greatest v pointv of Wear.l

f yOther'objects'and* y* v u l Avfentiori'will belevident' to' thoseskilled in the Fig. l is a partially"sectioned' plan' vieiv" of the invention;

of aieohipv breaker embodying" the eatirres Fig.. 2 isla section ythrough the :air sinibber5` taken on lcheline .2f-215i Figfl; v y Y {Fgs a sidevevv of the multiple-part Sweu'ahd n i ,L f

Figftis'aperspeotive viey'vrotone ofthe interchangeable ,parts of theffslioe.` Y' "As will. 'be observed riii `the eldraiving, y the chip-breaker 1,0 .is pivote'd atfll'jto 'a -rnatoher plate" 412 ink which*y a, suitably* drivenfA Cutter s object to 'provide' improved 'means fonetfectin'g a qniek ref radventag'es of the inf. n

r hefpiston is tion;

breaker to be sliifted'as' a unit toward or awayl fromv the *longitudinal axis ofJ the `assovoiated' Woodwvorking machine.Y The vchip ,Y K y breakerisheld against the Work, oiQin thef The principal'o'bject'of the invention isV absence otfanyfwork, against a: Slltlble' $5013 on .thefmateher plate,` by avresifliently yield-A, able air snubber. 14;.' Y l f Y i Y.

The device 14e-Which constitutes one" of' the principal features of the invention-omi- -sists otra oyl11ider'l5"\v`hioh isfpivotedfatone end tothe matoher plate, a hollo-iv piston 1 6 which vispositioned in tlieoylinder, a coil spring 1T which is compressed hetvv'efe'n, the

*ends thejylinder"and piston?, a one-Wayy spring-pressed ball valve: 18 which is positionedin? a port' 19in the cylinder for permittingrair to enter the -oyl'nder to replace anyijair escaping therefrom past *theV piston, and a stein 2O on thepiston havin forked end' portion '21 which' engages Witi a Alng 22 yon a"qiiick'release'which'is carried by the chip breaker. l y Y Y limited in its 1outward Inovement by a fflatf .ringy 24 Which'isV seem-'edV against' the openend of the Cylinder in over'- la'ppedrelation to the closed end of thefpiston., Thespring encompasses' ja rod which is .positioned Centrally :ivithinthehollow PQI"- tion ofthe pistom andfthe'air Chamber Within the eyli'nder is tofveonsfeqnently small dimen-4 sions. The Y,points of connection of the snubber vivijth" the chip breaker and the matehe'r platefare preferablylona line'adjaeerit the' pivotalfaxis ll of` the chip breaker, iaiidfany.' n pivotal movementlof theV ohipbreaker causes but a very'sma'll movement in the snu'bben NVhen the xvo'rkito be. ont comes yinto engagement with'l the shoe 26 of the chip breakeigitl moves the shoe baekivardly about therpivoiai axis-v1v1,iausmg the-'piston 16v ro move inwardlyf in theroylinder against the combined resistance of the spring and the air A,

inthe sainel As' the, Work passing the 'shoe' inovesfbaoliivardlylv or l forwardly' WithV the ity therewith, any` air1 that; `escapes .from the vincreases or 4din'iiiiishes infwidth, the shoe V Yeyli'l'id'erpast the 'being` replenished automatically through the valve 18. fliy means oi this construction, the shoe ot the chip breaker is caused to bear iirmly against the work without rebound or chatter.

The quick release 23, which carries the lug 22 engaged by the stem 2O ot' the snubber, consists of a small circular plate 2T which is secured to the lower end of pin 2S journaled in an aperture in the chip breaker. The lug 22 is secured eccentrically to and projects downwardly from the plate 2T, and a lever 29 is secured to the pin :2S above the chip breaker. |The lever 29 is provided with a handle l() on the end oit the same, and, when the lever is swung by the handle into the position shown in 'lull lines in the draw ing,`it abuts against a stop 31A on the chip breaker and holds the lug Q2 in a position past dead center relative to a line passing through the pivotal axis of the pin 28 and the pivotal axis of the connection between the snubber and the matcher plate. In order to release the chip breaker from the action of the snubber, it is merely necessary to swing the lever Qi) away 'l'rom the stop 3l into the position shown in dotted lines in the drawing, whereupon the lug 22 will be moved in an arc to a position out of engagement with the :forked end portion 2l of the stem 2U, and the snubber may be swung into the inoperative position shown in dotted lines in the drawing.

The shoe Q6 of the chipbreaker is of special construction, and is composed of a number ol interchangeable and separately reversible wearing` parts 32 which are arranged together in stacked relation in a holder 33. The holder 33 is )ivoted to the chip breaker at 34, and he d in any desired positiouof angular adjustment relative to the same by a set screw 35 and a locking screw 36. The holder is provided at :its lower front edge with a beveled lip 37 which extends freely beneath the work. and the wearing parts 32 are clamped in the holder by a screw 3S. The point ol greatest wear on the parts 32 is at the approximate location indicated by the numeral QG, and the purpose ot' the special shoe construction herein described is to permit easy and inexpensive renewal ot such wearing face.

Each of the parts 32 of the shoe is provided with a. liat rear face 3S) which lits against a similar face on the holder, and with a curved front or wearing face 40 which is of the same curvature adjacent both ends. Most ot' the work ordinarily operated on by a cutter head is ol` less thickness than the eomliined heights of the parts 32 in the holder. and, because ol. this, the lower part or parts receive the greatest amount of wear. To compensate for such unevenness in wear, the position ot the parts may be changed as frequently as necessary in order to maintain the proper wearing face at the desired point,

and the position ot any one or all ot the parts may be reversed end tor end with. the saine object in view, it being only necessary lo remore the screw 88 in order to ei'l'ect such re-arrangement.

l claim:

l. The combination with a movable chip breaker, olf' a snubber for the same character ized by al combined spring and air cushion.

Q. The combination with a movable chip breaker, and a snubber for the same, of a quick release, including a cam on the chip breaker adapted to be engaged by the snubber, and means for moving the cam into a position out ot engagement with the snubber'.

The combination with a pivotally mounted chip breaker, ol' a resiliently yieldable snublier i'or the same characterized by a combined spring and air cushion. y

Y `lf. The combination with a pivotally mounted chip breaker, oil' a snubber for the same, including a ccmipressible air chamber, and a spring tending to distend the chamber.

The combination with y a pivotally mounted chip breaker, of a snubber for the same, including a compressible air chamber', a spring in the chamber tending to distend the same, and a oneway valve in the chamber for permitting air to flow into the same to replace any air escaping therefrom past the piston. y i

G. The combination with a matcher plate, and a chip breaker pivotally mounted thereon, oi' a snubber connecting the matcher plate and the chip breaker and comprising a hollow cylinder connected to one of said menibers, a. piston in the cylinder connected to the other of said members, a spring in the cylinder tending to move the piston outiardly, and a one-way valve in the cylinder At'or permittingr air to flow into the same to replace any air escaping therefrom past the piston.

7. The combination with "a pivotally mounted chip lin'eaker, and a snubber `,tor the same, of a quick release. consisting of a cam on the chip breaker adapted to be engaged by the snubber, and a handle connected with the cam for moving the same into a position out oil engagement with the snubber.

S. The combination with a pivotally mounted chip breaker, and a snubber for the same, of a quick release. consisting of a member pivoted to the chip breaker, a lug secured to the member eccentricallyot the pivotal axis of the same for engagement with the snubber in one position of the member, a stop for holding the member in that Josition, and a handle `for moving the .memlier into or out of that position. y

9. In a chip breaker, a shoe for engagement with the Work, consisting of a stack of wear subjected parts which are interchangeable with each other and are separately reversible end :for end.

1,651,529 e @al 10. In a chip breaker, a' shoe for engage- Wearl subjected parts vWhich are provided ment with the Work,v said shoe being pro- Wth'curved Wearing faceset both ends and vided with wearing faces' at both ends and are interchangeable With each other and 10 being reversible end for end in the chip separately reversible end for end.

5 breaker. -1 In' testimony WhereofI have hereunto subv l1. In av chip breaker, a shoe for engage? scribed my name. ment with the Work, consisting of a, stack of WALLACE, D. JOHNSON. 

